But when the H1N1 pandemic prompted the creation of a new flu vaccine in 2009, the researchers were asked to test the new shot in the same way. This time, they looked at women who were pregnant in 2010, 2011, and 2012. That’s when they discovered the link with miscarriage.

Remember: It takes a lot more than a single study to upend existing recommendations. That’s how science works. Every new finding needs to be looked at in the context of all the evidence that came before it. And, as of now, the evidence overwhelmingly shows that pregnant women should still get the flu shot.